Cart for pavement breaker



1969 s. s. ERICSSON 3,

CART FOR PAVEMENT BREAKER Filed Feb. 7, 1968 SAMUEL S. ERICSSON INVENTOR BUCKHORN, BLORE, KLARQUIST & SPARKMAN ATTORNEYS United States Patent O Int. Cl. E01c 23/00 US. Cl. 29937 1 Claim ABSTRACT OF THE DISCLOSURE A cart for holding a pavement breaker during use thereof and facilitating its movement from location to location including a wheeled frame having a pair of upright cylinders with pistons connected to effect elevation of the pavement breaker. The pistons are weighted to apply the necessary weight to the pavement breaker when it is in actual use and suitable connections and valves are provided to effect operation of the pavement breaker and to effect raising of the same at the time desired. An extensible strut is connected between the handle and the ground breaking shoe of the breaker, whereby by adjusting the length of the strut the angular relationship of the pavement breaker axis to the ground surface may be adjusted.

BACKGROUND OF THE INVENTION The conventional manually operated pneumatic pavement breakers are necessarily heavy tools and because of their jolting, vibrating action are exceedingly fatiguing to operate when held by hand. Also, the breaking bit of the instrument is frequently embedded deeply in the pavement to be broken and a large amount of physical effort has to be applied to retract the bit from the pavement.

SUMMARY OF THE INVENTION The object of the present invention is to provide a wheeled carriage for supporting a pneumatic pavement breaker while in operation and which will facilitate its movement from location to location.

A further object is to provide a carriage of the type described having a pneumatic cylinder arrangement thereon to effect raising and lowering of the pavement breaker thereby to facilitate extraction of the bit from the pavement when it becomes embedded therein.

These and other objects of the invention will become more apparent from the detailed description of the device which in brief comprises a frame supported by a pair of Wheels so that the frame can be moved easily from one place to another. A pair of pneumatic cylinders are mounted on the frame in parallel relation. The pistons of the cylinders are interconnected with a crosshead having means thereon for connecting a pneumatic pavement breaker thereto so that the pavement breaker can be raised or lowered by operation of the cylinders. The pistons are weighted so that a proper load will be applied to the pavement breaker when it is in operation.

DRAWINGS FIG. 1 is a side elevation of a carriage made in accordance with the invention;

FIG. 2 is a front elevation thereof;

FIG. 3 is a fragmentary sectional view taken substantially along line 33 of FIG. 1;

FIG. 4 is a sectional view taken substantially along line 44 of FIG. 1;

FIG. 5 is an enlarged fragmentary sectional view taken substantially along line 5-5 of FIG. 2; and

FIG. 6 is a fragmentary sectional view taken substantially along line 66 of FIG. 2.

3,481,649 Patented Dec. 2, 1969 ice DESCRIPTION OF PREFERRED EMBODIMENT The illustrated embodiment of the invention includes a frame 10 including a base portion 12 consisting of opposite side plates 14 connected by a plate 18. A pair of wheels 20 are suitably journaled one to each of the plates 14.

The frame 10 also includes a ground-engaging foot portion including a ground-engaging foot 22 rigidly secured to a pair of arms 24 each of which is provided with an car 26 adapted to receive a bolt 28 which extends through an adjacent ear 30 extending rearwardly from the plate 18 whereby the foot 22 and its assembly may be swung about the horizontal axis of the bolts 28. Pivotally connected by a bolt 32 at its lower end to the arms 24 is an extensible strut 34, the length of which can be adjusted by means of a bolt 36 extending through an opening in the female member 38 and a selected one of openings 40 in the male portion 42 of the strut. The upper portion of the frame comprises a handle means pivotally connected to the upper end of the strut 34 by a bolt 44. The handle includes oppositely positioned handle portions 46 adapted to be grasped by the operator for moving the carriage in a manner hereinafter to be described. Extending forwardly from the handle 46 are a pair of brackets 48 which are rigidly connected by suitable means, such as by welding, one to each of a pair of cylinders 50, the lower ends of which are rigidly fastened as by welding to the plates 14. The upper ends of the cylinders 50 are connected by a yoke 54. Each of the cylinders 50 is provided with a piston 56 which are connected through suitable piston rods to a crosshead 58 which extends inwardly of each of the cylinders through a slot 60 in the upper portion side walls thereof. Weights 62 adapted to slide within the cylinders 50 are mounted upon each of the piston rods for a purpose to be explained.

Means is provided to connect a reciprocating type pavement breaker to the crosshead 58 in such relation that the axis of reciprocation of the pavement breaker will be substantially parallel to the axes of the cylinders 50. Such means includes a circular plate 64 welded to the crosshead 58. The lower surface of the plate 64 is flat. Positioned immediately beneath it is a circular late 66 having a flat upper surface engaging the bottom surface of the plate 64. A stud 68 extends upwardly from the plate 66 through the plate 64 and the crosshead 58 and has a nut 70 threaded on its upper end. When the nut 70 is tightened relative rotation between the plates 66, 64 is prevented but upon loosening of the nut 70 rotation of the plate 66 relative to the plate 64 may be made for a purpose to be explained. Suitably secured rigidly to the plate 66, such as by welding, is an elongate plate 74 which extends substantially at right angles to the crosshead 58. Indicated in dotted lines in the drawing is a pavement breaker 76. The handle 78 thereof is adapted to be clamped rigidly against the plate 74 by means of hangers 80.

The bottom end of the pavement breaker 76 is guided by means of a clamp assembly including oppositely positioned plates 86, the opposite end portions of which slidably engage the cylinders 50 as best seen in FIG. 4. The center portion of the members 86 is formed so as to engage the lower end of the body of the pavement breaker 76. Such pavement breakers may have round lower portions such as indicated in the drawing, or they may be rectangular or have other shapes and the clamps may be formed so as to fit the shape of the particular pavement breaker to be used in the device. Bolts 92 are provided so that the members 86 may be rigidly clamped about the pavement breaker. Upon loosening such bolts and the nut 70, the pavement breaker may be rotated to a new position if for some reason it is desired to change the position of the bit.

Control means are provided on the handle 46 for admitting air to the pavement breaker or to the cylinders 50 as may be desired. A control valve, including an operating lever 94, is positioned on the righthand handle 46. Air from a suitable source is supplied to a conduit 96 through the valve 94 and then through suitable conduits including the handle 46 and a conduit 95 to the pavement breaker. Likewise a suitable conduit system from an air supply is provided to convey air to the bottom of the cylinders 50 beneath the pistons 56, such means including a control valve 98 positioned on the lefthand handle.

When the device is to be utilized the brace 34 is adjusted so as to position the cylinders 50 and pavement breaker 76 with the axes thereof in desired relation to the ground, that is, either perpendicular or at an angle. Thereafter the nut 70 and bolts 92 may be loosened and the pavement breaker rotated so that the cutting tool thereof has the desired angle with respect to the device. The breaker is then reclamped and the valve 98 Operated so that the pistons 56 may lower and the tool of the pavement breaker engage the ground. The valve 94 is then operated to admit air to the pavement breaker which will cause reciprocation of the tool in the normal manner, the weights 62 within the cylinders serving to place the required load upon the pavement breaker. To raise the tool the valve 98 is operated to admit air to the lower end of the cylinders 50 whereupon the pistons 56 are elevated causing the tool to be withdrawn. If the tool is to be wheeled to a new location the crosshead 58 is raised to its utmost position and a manual latch 100 engaged beneath the crosshead 58 so as to hold the pavement breaker in its upper position so that the device can be freely wheeled to a new location.

Having illustrated and described a preferred embodiment of the invention, it should be apparent to those skilled in the art that the invention permits of modification in arrangement and details. I claim as my invention all such modifications as come within the true spirit and scope of the following claims.

4 I claim: 1. A carriage for supporting a pavement breaker comprising:

a frame including a base portion,

a pair of wheels journeled to said frame base portion for supporting the same,

a pair of cylinders,

means rigidly securing said cylinders at their lower ends to said frame base portion with said cylinders extending generally vertically and in axially parallel relation, said frame including handle means and means rigidly securing said handle means to the upper ends of said cylinders,

a pair of pistons one in each of said cylinders,

mounting means on said pistons for rigidly connecting the pistons to a reciprocation type pavement breaker with the axis of reciprocation of said breaker extending substantially parallel to said cylinder axes,

said frame including a ground engaging shoe pivotally connected to said frame base portion for pivotal movement about a horizontal axis,

and an extensible strut connected between said handle means and said ground engaging shoe, whereby by adjusting the length of said strut the angular rela tionship of said pavement breaker axis to the ground surface may be adjusted.

References Cited UNITED STATES PATENTS 2,217,674 10/1940 Curtis .173-23 3,369,614 2/1968 Anthony 17323 FOREIGN PATENTS 837,859 11/1938 France.

ERNEST R. PURSER, Primary Examiner US. Cl. X.R. 17323 

